Support for MicroPython 1.21

[robofwy]

Is it possible to build MicroPython v1.21 with support for CANPico for the Pico W?

I would like to build a project that uses both BLE and CAN. v1.21 is required for BLE support on the Pico W but the latest firmware appears to be built on v1.19.

Otherwise, I will have to use the C API I guess.

Any help would be appreciated.

[kentindell]

I have an internal 1.20 build already, so I'll look at bumping it to 1.21. If there aren't huge changes then I'll make a beta build for testing and drop it here.

[robofwy]

Thanks for that.

I have managed to build v1.21.0 (without patching it) on a 32-bit Debian host for the RPI_PICO_W board and everything seems to work except Bluetooth/BLE which causes it to lock up. The resultant firmware uf2 file is a different size to the one available from https://micropython.org/download/RPI_PICO_W so I am not sure what is wrong there. picotool shows the same output for both.

If I build the latest v1.22 master/preview, everything (including BLE) seems to work.

[robofwy]

I found out that this is a known issue with BLE on the Pico W with v1.21.0. If built with Arm GCC v12.3 or newer, it works ok. The version that Debian installs is v12.2.1 which does not work.

Using a 64-bit Debian host and downloading the Arm GNU Toolchain from https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads (x86_64 arm-none-eabi) and building with that fixes the problem but a better fix is to either increase the stack size in boards/RPI_PICO_W/mpconfigboard.cmake (e.g. to 5120) or to apply the patch https://github.com/micropython/micropython/pull/12647/files.

[Miki-AG]

Hi @kentindell is the 1.20 build available somewhere?

[kentindell]

Now updated for v1.22.2. It's in CANPico/firmware. Please try it out and see if you can build it - I might have forgotten a file (getting this to drop over the top of the upstream requires some delicate surgery).